Malicious PDF — malware analysis report

Static analysis result for SHA-256 b6db48d1e4cb6d1d…

MALICIOUS

PDF

75.4 KB Created: 2021-04-02 20:41:31 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7) First seen: 2021-07-07
MD5: 965475e1f3305eaa92685799eed9be69 SHA-1: 0a411f00a9fa9d513ed60a5ce0d4a0ad6a78d558 SHA-256: b6db48d1e4cb6d1d6f3f98ff10c1b40612c8fa1d1461e90734c72f6545194055
126 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

The file was detected as malicious by ML classifiers and ClamAV, indicating a high likelihood of malicious intent. It contains numerous external URIs, with one specifically identified as a link farm on disposable hosting, suggesting a phishing or malware distribution scheme. The presence of embedded URLs and the heuristic PDF_SEO_DISPOSABLE_LINK_FARM strongly indicate that the document's primary purpose is to redirect users to potentially harmful external sites.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9998

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://golowaki.ru/award?keyword=les+4+accords+tolteques+pdf+gratuit PDF link annotation
    • https://cdn.sqhk.co/roretuduva/ge3rSBp/tilinimew.pdfIn PDF document text
    • https://cdn.sqhk.co/pogezasamu/aoNfijg/78729624337.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4416653/normal_603a4057b91da.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4369912/normal_605d9771f35c1.pdfIn PDF document text
    • https://static.s123-cdn-static.com/uploads/4376103/normal_5fe2e6e5487d6.pdfIn PDF document text
    • http://rakomakefike.iblogger.org/what_are_the_4_factors_that_affect_climate.pdfIn PDF document text
    • https://cdn.sqhk.co/tijinujul/hcMihRn/xigasitu.pdfIn PDF document text
    • http://abzac.me/infinix_note_4_price_in_nigeria0ir6f.pdfIn PDF document text
    • http://zukixulen.mypressonline.com/1008445443.pdfIn PDF document text
    • http://heliusdesign.ru/dinner_places_near_me_take_outqzpr1.pdfIn PDF document text
    • https://cdn.sqhk.co/ravawiku/HggUhbo/emojination_2_3d_level_6.pdfIn PDF document text
    • https://cdn-cms.f-static.net/uploads/4387924/normal_6061f2ff3e1b5.pdfIn PDF document text
    • https://cdn.sqhk.co/benibavagoge/bMidigm/ligesonutelipupudov.pdfIn PDF document text
    • http://sallely.xyz/249869438591kafd.pdfIn PDF document text
    • https://cdn.sqhk.co/rosisole/Kgjib0j/marketing_strategy_planner.pdfIn PDF document text
    • http://www.ascendercorp.com/In PDF document text
    • http://www.ascendercorp.com/typedesigners.htmlIn PDF document text
    • http://rigozapovi.epizy.com/cut_paste_photo_editor_for_pc.pdfIn PDF document text
    • http://kaloruligot.onlinewebshop.net/how_do_you_change_the_battery_in_a_honeywell_thermostat_th3110d1008.pdfIn PDF document text
    • http://tumapaluk.rf.gd/polygamy_in_africa.pdfIn PDF document text
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://scripts.sil.org/OFLIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000e723.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE723 5476 bytes
SHA-256: 058c4be01af52367230099cf369e86bd79af14ef7c57d5268213ce85181efb22
font_01_sfnt_off0000f9d7.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xF9D7 11592 bytes
SHA-256: 33163fc4a7de734b5eef3d9fedd06150a2dbdfb21635a0e9bef530e15a8cd403

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